On Wednesday, April 23, 2014 13:21:39 Alan W. Irwin wrote: > On 2014-04-23 13:21-0400 Bill Hoffman wrote: > > On 4/23/2014 12:22 PM, Alan W. Irwin wrote: > >> However, if you discover the problem is a general one for > >> --find-package and Qt5, then it appears that Qt5 might be a good > >> illustrative example to use for your renewed effort at developing a > >> reliable --find-package capability. > > > > I recently ran into a project using --find-package and found a limitation > > that could be very problematic. If a find module in CMake uses a > > try-compile, or tries to figure out anything to do with the compiler, this > > command will fail. I am not sure there is a good way around this. > > Certainly try-compile is not actively discouraged in the CMake Modules, so > > this can be added to any module at any time, breaking --find-package in > > the > > future. > > Hi Bill: > > You cannot use --find-package unless you specify the language. So I > assume that --find-package enables the specified language, and, in > general, you would think that try-compile would work properly under > those circumstances.
No. It doesn't really enable a language, it only loads a bunch of files to set the most urgently required variables. Most of it is implemented in CMakeFindPackageMode.cmake It is basically wrapping a find_package() call, setting up just enough to make it succeed usually. try_compile() will fail. My plan was to limit this mode to Config.cmake files only, but as I said, due to the changes in CMake this has become too much work, so I won't work on that in the forseeable future. Alex -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers
